[sdiy] Mixed-signal problems (dsPIC digital delay project)

yo at vacoloco.net yo at vacoloco.net
Fri Jan 27 18:03:55 CET 2017


>> so with DAC as per normal you have 5mv to 7mV of noise. With DAC 
>> outputting 0v you get 4mV of noise. So the DAC, at it's worst is 
>> giving you 3mV of noise.
> 
> I don't follow that. In my view, if it's outputting 4mV of noise when
> there's no signal, it's giving me 4mV of noise. It's the input signal
> and the processing by my algorithm that's adding the extra 3mV. At
> this point, I'm not arguing about 1mV here or there though!

only way to prove that is to remove the DAC pin and connect it to 
ground.

Neil also made some good suggestions.

P



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